1. Monitoring of the optical and 2.5-11.7 μm spectrum and mid-IR imaging of the Seyfert 1 galaxy Mrk 279 with ISO ***
- Author
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Santos-Lleó, M, Clavel, J, Schulz, B, Altieri, B, Barr, P, Alloin, D, Berlind, P, Bertram, R, Crenshaw, DM, Edelson, RA, Giveon, U, Horne, K, Huchra, JP, Kaspi, S, Kriss, GA, Krolik, JH, Malkan, MA, Malkov, Yu F, Netzer, H, O'Brien, PT, Peterson, BM, Pogge, RW, Pronik, VI, Qian, B-C, Reichert, GA, Rodríguez-Pascual, PM, Sergeev, SG, Tao, J, Tokarz, S, Wagner, RM, Wamsteker, W, and Wilkes, BJ
- Subjects
galaxies : active ,galaxies : individual : Mrk 279 ,galaxies : nuclei ,galaxies : Seyfert ,infrared : galaxies ,astro-ph ,Astronomical and Space Sciences ,Astronomy & Astrophysics - Abstract
Mid-infrared images of the Seyfert 1 galaxy Mrk 279 obtained with the ISO satellite are presented together with the results of a one-year monitoring campaign of the 2.5-11.7 μm spectrum. Contemporaneous optical photometric and spectrophotometric observations are also presented. The galaxy appears as a point-like source at the resolution of the ISOCAM instrument (4-5″). The 2.5-11.7 μm average spectrum of the nucleus in Mrk 279 shows a strong power law continuum with α = -0.80 ± 0.05 (Fv ∝ vα) and weak PAH emission features. The Mrk 279 spectral energy distribution shows a mid-IR bump, which extends from 2 to 15-20 μm. The mid-IR bump is consistent with thermal emission from dust grains at a distance of ≳ 100 lt-d. No significant variations of the mid-IR flux have been detected during our observing campaign, consistent with the relatively low amplitude (∼10% rms) of the optical variability during the campaign. The time delay for Hβ line emission in response to the optical continuum variations is τ = 16.7-5.6+5.3 days, consistent with previous measurements.
- Published
- 2001